Customer Concentration	3 Months Ended
Customer Concentration	Mar. 31, 2015
Risks And Uncertainties [Abstract]
Customer Concentration	11. Customer Concentration During both the three months ended March 31, 2015 and 2014, no single client accounted for more than 10% of total revenue. One institutional investor client accounted for 13.2% and 13.6% of trading volumes during the three months ended March 31, 2015 and 2014, respectively.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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